4-02 



NATURAL HISTORY BULLETIN. 



arranged and nearly equidistant, but not readily seen without 

 the use of acid. In form the spores range from globose to 

 broadly ovate. The apical thickening of the teleutospores is 

 not a prominent feature, and is often essentially absent. 



34. Puccinia setari/e Diet. & Hohu. (1897. Bot. Gaz. 

 24:28.) 



34«. On Setaria imberbis (Poir) R. & S City of Mexico, Mex., Hohvay. 

 Orig. Desc. Sori mostly epiphyllous, elliptic or sublinear; u edosori cin- 

 namon-brown, naked ; spores elliptical or almost globose, sometimes 

 angular, 28-38 by 22-29//, with a thick closely verrucose epispore, and 

 6-8 germ-pores, dirty yellow-brown ; teleutosori pulvinate, black; spores 

 elliptical or obovate, rarely fusiform, not at all or only rarely con- 

 stricted, rounded at both ends, rarely conical at apex, 35-48 by 24-33 u. 

 epispore smooth, chestnut-brown, apex with a broad hooded thickening 

 (7.5-13//); pedicel thick, firm, up to 100 fi long, hyaline or pale brown. * 



There is a marked correspondence between this species and 

 Puccinia atra, both in gross and minute characters. The ap- 

 pearance of the sori of both uredo and teleutoforms, the form 

 and color of the teleutospores, and the form and surface mark- 

 ings of the uredospores are quite alike in both species, but 

 show a little stronger development in P. sctarice, even to the 

 papillae on the uredospores. The two species are clearly dis- 

 tinct, however, as shown by the number and arrangement of 

 the germ pores of the uredospores. 



In P. sctarice the teleutospores are more inclined to an 

 elliptical or obovate form with greater thickening of the apex. 

 The uredospores are thicker walled, with coarser papillae, and 

 with scattered germ pores, visually six in number. 



ERRATUM. 



The parenthe*is enclosing authority for the name of No. 28 on page 

 390 should be cancelled; the correct writing; for the name is Puccinia sub- 

 sterilis E. & E. 



